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# frozen_string_literal: true
module Vedeu
# Converts the array of elements provided into a comma separated
# sentence with the penultimate and ultimate elements separated with
# the word 'and'.
#
# @api public
#
class Sentence
# @param (see #initialize)
# @return (see #construct)
def self.construct(elements, label = 'elements')
new(elements, label).construct
end
# @param elements [Array]
# @param label [String]
# @return [Vedeu::Sentence]
def initialize(elements, label = 'elements')
@elements = elements
@label = label
end
# @return [String]
def construct
if one?
first
elsif two?
elements.join(' and ')
elsif many?
[but_last, last].join(' and ')
else
"No #{label} have been assigned."
end
end
protected
# @!attribute [r] elements
# @return [Array]
attr_reader :elements
# @!attribute [r] label
# @return [String]
attr_reader :label
private
# @return [Boolean]
def one?
count == 1
end
# @return [Boolean]
def two?
count == 2
end
# @return [Boolean]
def many?
count > 2
end
# @return [Array]
def but_last
elements[0...-1].join(', ')
end
# @return [Object]
def first
elements.first
end
# @return [Object]
def last
elements[-1]
end
# @return [Fixnum]
def count
elements.size
end
end # Sentence
end # Vedeu
Version data entries
17 entries across 17 versions & 1 rubygems